E-Beth wrote:my spool holders on my machines have little felt washers to cushion the spool.
... That would make a difference, and I'm not surprised that, if mine once had something like that, that it would be missing. It's around 15 years old and has been stuffed in the back room in storage for roughly 10 of that. I only recently managed to get the space to dig it back out and try to use it. (And I'm still having to sew standing up because it's on something I can't get a chair under... but I'm saving for a new desk...)
Back on topic (I wander off like that a lot), I made a 'washer' out of a scrap of polar fleece (I looked for felt, I know I saw some just a few days ago, but I couldn't find it), and now have that under the spool-bobbin with the nut on top... XD
PS: Just because, here's my machine
And here's my new little 'washer' XD
Ok, so it's square... I don't think that'll matter...